Pack-casing for photographic-film packs provided with pulling-tabs.



0. BECKER.

PACK CASING FOR PHOTOGRAPHIG FILM PACKS PROVIDED WITH PULLING TABS.

APPLICATION FILED MAY 14, 1913.

1,127,851 Patented Feb. 9, 1915.

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flttorizey THE NORRIS PETERS ca, PHOTc-LITHQ. WASHINGTON, n. c.

"UNITED STATES PATENT @FFHUE.

oscan BECKER, or s'tinnnnn, NEAR BERLIN, GERMANY.

Specification of Letters Patent.

Patented Feb. 9, 1915.

Application filed May 14, 1913. Serial No. 767,727.

To all 207mm it may concern;

Be it known that 1, Oscar BECKER, a subject of the German Emperor,residing at Tempelhoferstrasse 78", Siidende, near Berlin, Germany, haveinvented certain new and useful Improvements in Pack-Casings forPhotographic-Film Packs Provided with Pulling-Tabs, of which thefollowing is a specification.

This invention relates to the type of pack casings for photographic filmpacks provided with pulling tabs, in which a partition separates theexposed films from the unexposed films. Existing film pack casings ofthis type when made of paper or cardboard, have the drawbacks that theyeasily get bent in being handled, and also that they are very liable toallow light to penetrate at the front edges. Such film pack casings whenmade of sheet metal while avoiding those drawbacks, have however thedisadvantage of being complicated, difficult and costly to make, becausetheir manufacture requires a comparatively large amount of sheet metal.Namely the front and the back of the pack casing and the partitionbetween the exposed and unexposed films require metal sheets eachapproximately of the superficial area of the pack casing. In order tokeep out the light, the corners of box-like parts have to be madecomparatively sharp and deep. which occasions considerable diiiicultyand waste of material in the manufacture. These well known boxlike packcasings have also the drawback that it is not possible to take out afilm singly without having to open the whole pack casing for thispurpose and thus running the risk of deforming the pack casing.

N ow the present invention has for its object to provide an improvedfilm pack casing of the above specified type consisting of sheet metal,and so made that the cost of its manufacture shall be low, and theimproved pack casing shall allow of the exposed film being taken outsingly in a very simple manner without damaging the pack casing orhaving to open the whole pack casing forthis purpose. This object iseffected according to this invention by constructing the improved filmpack casing with a back wall provided with a slide and with springpressure members, one narrow end of the said back wall being curled overso as to form one side of the guiding frame on the front of the packcasing. The other sides of the guiding frame are constituted by across-member and two narrow recessed side members which engagecover-fashion over the edges of the back wall, the curled end of thelatter and the ends of the cross member, and thereby close the packcasing in a light-tight manner. The spring members of the back wallserve to press the film pack against the guiding frame, and for thisreason the partition between the exposed and unexposed films need nolonger be made of metal as is the case with most existing pack casings.All the parts of the pack casing are held. together firmly andpermanently by cross rods fixed in the ends of the sides by riveting orany other means. One of these rods serves also as a support over whichthe films are bent in the changing operation.

One embodiment of this invention is illustrated by way of example in theaccompanying drawings, in which Figure 1 is a vertical section of theimproved pack casing, and Fig. 2 is a perspective view of the severalconstituent members of the same taken apart to show the internalconstruction.

As shown. anv desired number of films (7 with their usual pulling tabs7' are arranged against a partition a made for instance of cardboard,back strips 7) impervious to light being located in the usual mannerbetween thefilms. The stri s 7) proiect beyond that edge of the filmswhich is opposite the pulling tabs and are held at this spot in theusual manner bv means of a rivet or the like in a mount 0. This deviceprevents the next film which is not to be changed from being removedwith the film to be changed.

The improved pack casing consists of the back wall (Z, which is out outat one end for the insertion of a sl de e and is curled over at itsother end. This curled end r constitutes one end of the casing and itsedge is situated at such a distance from the back wall (Z as to allowthe upper end of the film pack to he slipped into the curl r.

f are short pieces left standing at the sides of the back wall (Z; theyare cut out in the form of springs g and are so bent as to bring thesesprings approximately parallel to the back wall (Z at a determineddistance from the latter.

The lower edge of the pack casing is constituted by a round bent sheetmetal cross member it having a smooth back 2' which cooperates with theslide e slidably mounted on the back wall d to form a slot, throughwhich the pulling tabs y project to the outside of the pack casing.

The sides of the pack casing are formed by narrow cap-like sheet metalmembers 7r with rounded ends; their projecting borders embracecover-fashion the longitudinal edges of the back Wall, the curled end 1'and the ends of the cross member h. The caps is also constitute thelongitudinal sides of a frame for guiding the filmpack. The transversesides of this guiding frame against which the unexposed portion of thefilm pack lies, are constituted by the edges of the curled end 7 and thecross member h.

0 are holes formed in the side caps in near the ends thereof, for thereception of stay rods m, n.

'T he operation of putting up a film pack in the improved film packcasing is as followsz-The film pack is placed into the open pack casing,the pulling tabs 7' being led underneath the springs g, and thepartition a is placed on the latter! '1 he pulling tabs are bent overtoward the back in the usual manner so that their bends come underneaththe curl 1'. Then the pack casing is closed by vslipping the sheet metalcaps 70 over the edges of the back wall cl and the ends of the crossmember h. The projecting borders of the sheet metal caps is thus comeover the front of the film pack and form, with the cross member h andthe edge of the curl r, the guiding frame for the film pack. The freeends of the pulling tabs j then project through the slot formed by thesurface 2' of the cross member 7; and the slide 6. The

latter is. provided with a jointing strip.

Then the stay rods m, n or equivalent devices are slipped through theholes 0 in the sheet metal caps k, and their ends riveted over on theoutside, thereby fastening together the assembled parts so as to form astrong self-contained pack casing in which the film pack is inclosed ina perfectly lighttight manner.

The upper stay rod '11, is situated under the bending place of thepulling tabs j, so as to serve as a support over which the films arebent in being changed. The stay rod m is situated inside the curved partof the cross member ii- If desired, the stay rod n may be inserted firstin its proper position in the film pack, in which case the caps 79 willthen have .to be slipped over the ends of the stay The mount 0, may beprovided with stops 7) against which the edges of the back sheets Z)bear in changing the films.

If it is desired to take out one or more films before exposing all thefilms, it is merely necessary to open the slide 6, which can be done inthe dark, without risk of the remaining films in the pack becomingdisarranged or spoiled.

What 1 claim is 2- V 1. In a photographic film pack casing for holding apack of films with pulling tabs and a separating wall between theexposed and unexposed films, the combination of two rounded orchannel-shaped cross members, a back wall, and two separate side capsengaging the ends of said cross members in a light-tight manner, wherebyan improved film pack casing is produced wherein the edges of said crossmembers and said side caps constitute together the frame against whichthe films are pressed into the focal plane, and which said edges alsoconstitute abutments and a light-tight closure for the back Wall.

2. In a photographic film pack casing of the type specified, thecombination of two rounded channel-shaped cross members, a back wall,two side caps each with a perforation in each end adapted to embracecoverfashion the edges of said cross members and said back wall, and twostay rods for staying the pack casing in the transverse direc tion, oneof said stay rods passing through the perforations in the adjacent endsof said side caps, and inside the corresponding cross member locatedbetween said side caps, and the other stay rod being similarly arrangedat the opposite end of the pack casing, one of said stay rods servingalso as a support over which the films pass in being changed.

3. In a photographic film pack casing of the type specified, thecombination of a back Wall having a rounded channel-shaped cross memberintegral therewith at one end, a rounded channel-shaped cross member atthe opposite end of said back wall but not integral therewith, a sidecap at each side of the caving fitting the corresponding edges of saidtwo cross members and said back plate, and means for holdingtransversely the two side caps tightly against the intermediatelylocated cross members and said back plate.

4;. In a photographic film pack casing of the type specified, thecombination of a back plate, rounded channel-shaped cross members at thetop and bottom ends of said back plate, side caps fitting the two sideedges of said back plate and said cross members,

pressure springs integral with said back,

plate for pressing each fi m f r exposure plate to provide a space forthe exposed films between said springs and said back plate, and meansfor holding transversely said side caps tightly against theintermediately located cross members and said back plate.

5. In a photographic film pack casing of the type specified, thecombination of a back plate having an aperture therein, roundedchannel-shaped cross-members at the top and bottom ends of said backplate, side caps fitting the two side edges of said back plate and saidcross members, means for holding transversely said side caps tightlyagainst the intermediately located cross members and said back plate,and a slide normally covering the aperture in said back plate, andadapted to uncover same to allow of the removal of the exposed filmssingly, said slide being located at a sufficient distance from saidcross member to form a slot for the passage therethrough of the pullingtabs of the films.

In testimony whereof I aifix my signature in presence of two Witnesses.

OSCAR BECKER.

Witnesses WOLDE AR HAUPT, HENRY HAsPER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

